What has been the trend in human evolution since the appearance of the Cro-Magnons?
a. Several small subspecies have appeared, acclimated to mini-environments.
b. Evolution has proceeded slower than usual.
c. Evolution has become cultural rather than biological.
d. Peripheral speciation has resulted in the emergence of the Neanderthals.
e. Size of organisms has steadily decreased.
c
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Which agricultural revolution is characterized by the emergence of a commercial market for food and the beginnings of the industrialization of agriculture?
A) first B) second C) third D) fourth
________ are groups of the same kinds of atoms that cannot be broken down into other substances by ordinary chemical means
A) Molecules B) Electrons C) Elements D) Minerals
In the short-range weather forecasts of this chapter, we assumed that the pressure systems and fronts were ____
a. moving at a constant rate b. accelerating along a random curve c. stable and unchanging d. moving towards zero e. exactly identical
________ is/are the source of energy used in the production of electricity by nuclear power plants
A) Natural gas B) Nuclear fusion C) Nuclear reactions D) Nuclear fission E) Breeder reactions